JP2008066227A - Super-saturation reactor unit for thermal relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a super-saturation reactor unit in which a super-saturation reactor is unitized and an assembly and wiring work with a thermal relay can easily be done. <P>SOLUTION: A super-saturation reactor which is to be fixed from outside with a thermal relay and is to be connected in parallel with a built-in heat element is unitized, and a reactor unit 7 is composed as follows: namely, on an independent single installation unit composed of a base part 7a, a terminal base part 7b and a power source terminal 7c, there is integrally formed a case part 7e to house a whole of super-saturation reactor of each phase, and one side of a lead wire 3c drawn from a coil part 3b of the super-saturation reactor 3 housed in the case part is connected with a power source terminal 7c provided on a unit top end through a connecting board 7f arranged on the terminal base part. And, the other side of the lead wire 3d is drawn through an inside of the base part 7a to a front end part of the base and is connected with a load side terminal 2b of the thermal relay 2 mounted on the unit and the super-saturation reactor 3 is connected in parallel with the in-built heat element of the thermal relay. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an assembly structure of a supersaturated reactor unit that is used by being externally attached to a thermal relay applied to a motor power supply circuit in combination with an electromagnetic switch.

As is well known, in an electromagnetic switch (electromagnetic contactor) used in a power supply circuit of a motor that starts with a load having a large inertia, an electromagnetic switch is used in order to coordinate protection with the upper circuit breaker. And a thermal relay with a supersaturated reactor (thermal overload relay).
This delay type thermal relay has a cored supersaturated reactor connected in parallel with a bimetal heating heat element (heater) built in a standard type thermal relay (without a supersaturated reactor). In the current range up to about%, load current is passed through the heater, and in the overcurrent range exceeding that, the reactor core is saturated to increase the shunt current to the reactor, and the current to the heater is limited to limit the operating time. In the prior art, a standard thermal relay is used in combination (externally) with a supersaturated reactor (see, for example, Patent Document 1).

  Next, FIG. 5 shows a conventional assembly structure in which a supersaturated reactor is externally attached to a thermal relay attached to an electromagnetic switch, and FIG. 6 shows an external appearance of the thermal relay alone. In each figure, 1 is an electromagnetic switch (electromagnetic contactor), 2 is a standard thermal relay, 3 is a supersaturated reactor externally attached to the thermal relay 2, 4 is a mounting base plate, and the supersaturated reactor 3 is as described below. And connected in parallel to the heat element built in the thermal relay 2. In addition, the thermal relay 2 in the illustrated example is directly connected by inserting the rod-shaped power source side terminal 2a protruding from the top of the relay body into the load side terminal 1a of the electromagnetic switch 1 after being assembled to the electromagnetic switch 1. The assembly unit is used in the switchboard and control panel. In addition, 2b is a load side terminal arranged at the lower part of the front side of the thermal relay 2, 2c is an auxiliary terminal, 2d is an adjustment dial, and 2e is a reset button.

  The supersaturated reactor 3 has a structure in which a coil 3b is wound around an iron core 3a. The supersaturated reactor 3 is arranged on the mounting base plate 4 after being arranged around the thermal relay 2 for each phase. For each phase, a crimp terminal 5 is attached to a lead wire (insulation coated wire) drawn from both ends of the coil 3b of the reactor 3, and one lead wire 3c is a load side terminal (screw terminal) 1a of the electromagnetic switch 1. The other lead wire 3d is connected to the load side terminal (screw terminal) 2b of the thermal relay 2 so that the supersaturated reactor 3 is connected in parallel with a heat element (not shown) built in the thermal relay 2. .

  On the other hand, as an optional unit of the electromagnetic switch 1, a self-standing single installation unit that separates and supports the thermal relay 2 from the electromagnetic switch 1 is known (for example, see Non-Patent Document 1), and its structure. Is shown in FIGS. 7 (a) and 7 (b). That is, the single installation unit 6 is a substantially L-shaped resin molded product including a base portion 6a for mounting and supporting the main body of the thermal relay 2 and a terminal base portion 6b that stands upward from the rear portion of the base portion 6a. A power source side terminal (screw terminal) 6c for inserting and connecting a rod-shaped power source side terminal 2a (see FIG. 6) drawn from the thermal relay 2 is provided at the top of the terminal block 6b. In addition, 6d is a through-hole of the attachment screw opened to the corner of the base part 6a.

When the thermal relay 2 is mounted on the single installation unit 6 and installed in the panel, the single installation unit 6 on which the thermal relay 2 is mounted is screwed to a mounting base plate dedicated to the unit arranged in the panel. After fixing and fixing the supersaturated reactor 3 in the surrounding area, one lead wire 3c drawn from the reactor coil is connected to the power supply side terminal 6c (see FIG. 7) of the single installation unit 6, and the other The lead wire 3d is connected to the load side terminal 2b of the thermal relay 2. In addition, the power supply side terminal 6c of the single installation unit 6 and the load side terminal 1a (see FIG. 5) of the separate electromagnetic switch 1 are connected by wiring with another lead wire.
JP-A 63-276846 Online catalog “Fuji Magnetic Contactor / Electromagnetic Switch”, p28, Thermal Relay Single Unit, [Search July 30, 2006], Internet, <http://www.fujielectric.co.jp/fcs/jpn /edc/catalog2/AH210q/AH210q_14.pdf>

By the way, the conventional thermal relay with a supersaturated reactor including the assembly form shown in FIG. 5 has the following problems.
That is, in order to externally attach the supersaturated reactor 3 to the mounting base plate 4, various additional parts are required, and the mounting base plate 4 is also increased in size to increase the installation area. In addition, since the lead wire 3d drawn from the supersaturated reactor 3 of each phase is connected to the load side terminal 2b of the thermal relay 2, when the user wires an electric wire on the load side of the thermal relay 2, each phase It is necessary to remove the lead wire 3d of the reactor 3 from the terminal block of the thermal relay 2 and then fasten it together with the electric wire of the external wiring and reconnect it to the load side terminal 2b. There is a risk that a connection error (R, S, T phase) of the line 3d may be mistaken to cause a wiring error of the supersaturated reactor 3.

  Furthermore, if the supersaturated reactor 3 is installed in a bare state as shown in the figure, there is a risk that the user touches the charging unit during energization and receives an electric shock. In addition, because the lead wires 3c and 3d of the reactor 3 are routed around the thermal relay, it is necessary to secure a large wiring space in the panel, and the lead wires are connected to other devices and structures by vibrations. Touching and tearing the insulation coating may cause a short circuit accident.

  The present invention has been made in view of the above points, and is a supersaturated reactor unit for a thermal relay in which the above-described single installation unit is modified so that a supersaturated reactor can be assembled and wiring between the thermal relay can be easily performed. Is to provide.

In order to achieve the above object, in the present invention, a supersaturated reactor unit externally attached to a thermal relay attached to an electromagnetic switch and connected in parallel to a built-in heat element of the thermal relay is configured as follows.
A stand-alone single installation unit that supports and mounts a thermal relay separated from an electromagnetic switch is integrated with a case part that collectively stores supersaturated reactors for each phase, and the supersaturated reactors stored in the case part are integrated. Connect one lead wire drawn from the coil to the power supply side terminal provided on the top of the single installation unit, and load the other lead wire inside the base of the single installation unit on the load base terminal of the thermal relay (Claim 1).

Moreover, in the unit of the said structure, the wiring structure of a reactor coil can be comprised in the following aspects.
(1) A connection board for coil wiring is laid inside the single installation unit, and between the power supply side terminal provided on the top of the unit via the connection board and one lead wire drawn from the coil of the supersaturated reactor. Wiring (claim 2).
(2) The other lead wire drawn from the coil of the supersaturated reactor is drawn to the front end side of the base through the base of the single installation unit, and the load of the thermal relay placed on this position base It connects to a side terminal (Claim 3).

As in the above configuration, the coil of the supersaturated reactor that is housed in the case part of this installation unit after integrally forming the case part that houses the supersaturation reactor in the self-standing single installation unit of the thermal relay as an optional unit of the electromagnetic switch The following effects can be obtained by wiring the lead wire led out from the power supply side terminal and the front end side of the unit base through the inside of the installation unit without routing the unit outward.
(1) When a thermal relay is applied to a motor power circuit, etc., mounting the thermal relay on the oversaturated reactor unit prepared as an optional unit eliminates the need for troublesome external installation and wiring work. The supersaturated reactor can be used in parallel with the built-in heat element of the thermal relay, improving convenience.
(2) The supersaturated reactor housed in the case part of the unit is not exposed to the outside, so that the safety protection of the charging part and the improvement of the reliability can be achieved.
(3) A mounting base plate for fixing a supersaturated reactor alone is not required as in the prior art, and assembly parts can be reduced, and the unit can be made smaller and more compact.
(4) The supersaturated reactor wiring work performed by the user can be easily performed without wiring mistakes.

Embodiments of the present invention will be described below based on the examples shown in FIGS. 1 to 3 are outline views of a supersaturated reactor unit equipped with a thermal relay, and FIG. 4 is a wiring structure diagram of a supersaturated reactor and a connecting plate incorporated in the unit. The members corresponding to those in FIG.
The illustrated embodiment is based on an existing stand-alone installation unit 6 (see FIG. 7) on which a thermal relay 2 is mounted and supported as an optional unit, and a case portion for collectively storing supersaturated reactors 3 for each phase is integrally formed at the rear of the base. Thus, the supersaturated reactor is unitized, and a supersaturated reactor unit 7 is configured by additionally installing a connection plate described later inside the unit.

  This supersaturated reactor unit 7 includes a base part 7a for mounting and supporting the thermal relay 2 in the same manner as the existing self-standing single installation unit 6 shown in FIG. 7, a terminal base part 7b rising from the base part 7a, A power supply side terminal 7c disposed on the top of the terminal block 7b is provided, and a case portion 7e for collectively storing R, S, T three-phase supersaturated reactors 3 is integrally formed at the rear portion of the base 7a. ing. Further, a connection plate 7f is provided inside the terminal block portion 7b, and the power supply side terminal 7c and one lead wire 3c drawn from the coil portion 3b of the supersaturated reactor 3 are connected via the connection plate 7f. . As shown in FIG. 4, the connecting plate 7f is a conductor piece in which the upper end is bent in an L shape to form a terminal portion, and the terminal portion is superposed on a power supply side terminal (screw terminal) 7c provided on the top of the unit. The lead 2c is fastened together with the power supply side terminal 2a of the relay 2, and the lead wire 3c is brazed and connected to the lower end. Further, the other lead wire 3d of the reactor coil is drawn out to the front end side of the base portion 7a via the inside (bottom surface) of the base portion 7a, and the crimp terminal 8 is attached.

  In order to connect the supersaturated reactor 3 to the thermal relay 2 in parallel using this supersaturated reactor unit 7, the base portion 7a of the unit is screwed to the mounting base plate arranged in the panel, and then the base The thermal relay 2 is mounted on the portion 7a, and the power supply side terminal (rod terminal) 2a of the thermal relay is inserted and connected to the power supply side terminal 7c of the supersaturated reactor unit 7. Thereby, one lead wire 3c drawn out from the coil of the supersaturated reactor 3 is connected to the power supply side terminal 2a of the thermal relay 2 through the connection plate 7f. Next, the other lead wire 3d of the reactor coil drawn out to the front end side of the base portion 7a in advance is connected to the load side terminal 2b of the thermal relay 2. Thereby, the supersaturated reactor 3 is connected in parallel to the built-in heat element of the thermal relay 2. Then, the power supply side terminal 7c of the supersaturated reactor unit 7 and the load side terminal 1a of the electromagnetic switch installed in the same panel are connected by another lead wire.

  As can be seen from the above description, the supersaturated reactor 3 can be easily externally connected to the thermal relay 2 and connected in parallel simply by mounting the thermal relay 2 on the supersaturated reactor unit 7 and simply connecting the wiring. Further, in this assembled state, the charged portion of the supersaturated reactor 3 is not exposed to the outside, and the lead wires 3c and 3d of the reactor coil are also wired inside the unit, and the conventional assembly structure shown in FIG. High safety can be ensured.

The side view showing the assembly state which mounted the thermal relay in the supersaturated reactor unit by the Example of this invention. Plan view of FIG. External perspective view of FIG. Wiring structure diagram of supersaturated reactor and connection board built in unit of Fig. 1 Assembly structure diagram of a conventional example in which a supersaturated reactor is connected externally to a thermal relay installed in an electromagnetic switch External perspective view of thermal relay It is the block diagram of the assembly state which mounted the thermal relay in the self-standing type single installation unit of the conventional example, (a), (b) is a side view and a plan view, respectively

Explanation of symbols

1 Electromagnetic switch 2 Thermal relay (thermal overload relay)
2a Power supply side terminal 2b Load side terminal 3 Supersaturated reactor 3b Reactor coil 3c, 3d Lead wire 7 Supersaturated reactor unit 7a Base part 7b Terminal block part 7c Power supply side terminal 7e Case part 7f Connection plate

Claims (3)

A supersaturated reactor unit that is externally attached to a thermal relay of an electromagnetic switch and connected in parallel to a built-in heat element of the thermal relay,
Separately from the electromagnetic switch, a stand-alone independent installation unit that supports and mounts a thermal relay is integrated with a case part that collectively stores supersaturated reactors for each phase, and then from the coil of the supersaturated reactor stored in the case part Connect one lead wire drawn out to the power supply side terminal provided on the top of the single installation unit, and connect the other lead wire to the load side terminal of the thermal relay mounted on the base through the base of the single installation unit A supersaturated reactor unit for a thermal relay, characterized by The supersaturated reactor unit according to claim 1, wherein a connecting plate for connecting between a power supply side terminal provided at the top of the unit and one lead wire of the supersaturated reactor is installed inside the single installation unit. Supersaturated reactor unit for thermal relay. The supersaturated reactor unit according to claim 1, wherein the other lead wire of the supersaturated reactor is drawn out to the front end side of the base through the inside of the base of the single installation unit.

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